'''i = 1
while i <6:
    print('*')
    i+=1'''

'''i = 1
while i <6:
    print('*')
    i+=1'''

'''i = 1
while i <= 5:
    #print('*')
    j = 1
    while j <= i:
        print('*',end='')
        j += 1
    print()
    i += 1
i = 0
while i<=3:
    print('$')
    i += 1
x = 1
while x<=9:
    y = 1
    while y<=x:
        print(f'{x}*{y}={x+y}\t',end='')
        y = 1
    print()
    x += 1'''
s = 1
p = 1000
while s<30:
    print('这是第%d场演唱会\n有%d位人' %(s,p))
    p += 20
    print(f'这是第{s}场演唱会\n人数为{p}')
    s+=1







